from flask import render_template, redirect, request, url_for, flash
from flask_login import login_user, logout_user, login_required, current_user
from . import auth
from .. import db
from ..models import User
from ..email import send_email
from .forms import LoginForm, RegistrationForm, ChangePasswordForm, PasswordResetForm, PasswordResetRequestForm, ChangeEmailForm

@auth.route('/confirm/<token>')
@login_required
def confirm(token):
	if current_user.confirmed:
		return redirect(url_for('main.index'))
	if current_user.confirm(token):
		db.session.commit()
		flash('你确认了你的账户，谢谢')
	else:
		flash('确认链接无效或已过期')
	return redirect(url_for('main.index'))

@auth.before_app_request
def before_request():
    if current_user.is_authenticated:
        current_user.ping()
        if not current_user.confirmed and request.endpoint and request.blueprint != 'auth' and request.endpoint != 'static':
            return redirect(url_for('auth.unconfirmed'))

@auth.route('/unconfirmed')
def unconfirmed():
	if current_user.is_anonymous or current_user.confirmed:
		return redirect(url_for('main.index'))
	return render_template('auth/unconfirmed.html')

@auth.route('/confirm')
@login_required
def resend_confirmation():
	token = current_user.generate_confirmation_token()
	send_email(current_user.email, '确认你的账户',
				'auth/email/confirm', user=current_user, token=token)
	flash('新的确认邮件已经发送到您的邮箱')
	return redirect(url_for('main.index'))

@auth.route('/login', methods=['GET', 'POST'])
def login():
	form = LoginForm()
	if form.validate_on_submit():
		user = User.query.filter_by(email=form.email.data).first()
		if user is not None and user.verify_password(form.password.data):
			login_user(user, form.remember_me.data)
			next = request.args.get('next')
			if next is None or not next.startswith('/'):
				next = url_for('main.index')
			return redirect(next)
		flash('用户名密码无效')
	return render_template('auth/login.html', form=form)

@auth.route('/register', methods=['GET', 'POST'])
def register():
	form = RegistrationForm()
	if form.validate_on_submit():
		user = User(email=form.email.data,
					username=form.username.data,
					password=form.password.data)
		db.session.add(user)
		db.session.commit()
		token = user.generate_confirmation_token()
		send_email(user.email, '确认你的账户', 'auth/email/confirm', user=user, token=token)
		flash('确认邮件已经发送到您的邮箱')

		return redirect(url_for('main.index'))
	return render_template('auth/register.html', form=form)

@auth.route('/logout')
@login_required
def logout():
	logout_user()
	flash('你正在退出')
	return redirect(url_for('main.index'))

@auth.route('/change-password', methods=['GET', 'POST'])
@login_required
def change_password():
    form = ChangePasswordForm()
    if form.validate_on_submit():
        if current_user.verify_password(form.old_password.data):
            current_user.password = form.password.data
            db.session.add(current_user)
            db.session.commit()
            flash('Your password has been updated.')
            return redirect(url_for('main.index'))
        else:
            flash('Invalid password.')
    return render_template("auth/change_password.html", form=form)


@auth.route('/reset', methods=['GET', 'POST'])
def password_reset_request():
    if not current_user.is_anonymous:
        return redirect(url_for('main.index'))
    form = PasswordResetRequestForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data).first()
        if user:
            token = user.generate_reset_token()
            send_email(user.email, 'Reset Your Password',
                       'auth/email/reset_password',
                       user=user, token=token)
        flash('An email with instructions to reset your password has been '
              'sent to you.')
        return redirect(url_for('auth.login'))
    return render_template('auth/reset_password.html', form=form)
@auth.route('/reset/<token>', methods=['GET', 'POST'])
def password_reset(token):
    if not current_user.is_anonymous:
        return redirect(url_for('main.index'))
    form = PasswordResetForm()
    if form.validate_on_submit():
        if User.reset_password(token, form.password.data):
            db.session.commit()
            flash('Your password has been updated.')
            return redirect(url_for('auth.login'))
        else:
            return redirect(url_for('main.index'))
    return render_template('auth/reset_password.html', form=form)


@auth.route('/change_email', methods=['GET', 'POST'])
@login_required
def change_email_request():
    form = ChangeEmailForm()
    if form.validate_on_submit():
        if current_user.verify_password(form.password.data):
            new_email = form.email.data
            token = current_user.generate_email_change_token(new_email)
            send_email(new_email, 'Confirm your email address',
                       'auth/email/change_email',
                       user=current_user, token=token)
            flash('An email with instructions to confirm your new email '
                  'address has been sent to you.')
            return redirect(url_for('main.index'))
        else:
            flash('Invalid email or password.')
    return render_template("auth/change_email.html", form=form)

@auth.route('/change_email/<token>')
@login_required
def change_email(token):
    if current_user.change_email(token):
        db.session.commit()
        flash('Your email address has been updated.')
    else:
        flash('Invalid request.')
    return redirect(url_for('main.index'))